org.apache.cassandra.tracing

Class Tracing

java.lang.Object

org.apache.cassandra.tracing.Tracing

All Implemented Interfaces:

ExecutorLocal<TraceState>

public abstract class Tracing
extends java.lang.Object
implements ExecutorLocal<TraceState>

A trace session context. Able to track and store trace sessions. A session is usually a user initiated query, and may have multiple local and remote events before it is completed.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Tracing.TraceType

Field Summary

Fields

Modifier and Type	Field and Description
static Tracing	instance
protected static org.slf4j.Logger	logger
protected java.util.concurrent.ConcurrentMap<java.util.UUID,TraceState>	sessions
static java.lang.String	TRACE_HEADER
static java.lang.String	TRACE_TYPE

Fields inherited from interface org.apache.cassandra.concurrent.ExecutorLocal

all

Constructor Summary

Constructors

Constructor and Description
Tracing()

Method Summary

Modifier and Type	Method and Description
abstract TraceState	begin(java.lang.String request, java.net.InetAddress client, java.util.Map<java.lang.String,java.lang.String> parameters)
TraceState	begin(java.lang.String request, java.util.Map<java.lang.String,java.lang.String> parameters)
void	doneWithNonLocalSession(TraceState state)
TraceState	get() This is called when scheduling the task, and also before calling ExecutorLocal.set(Object) when running on a executor thread.
TraceState	get(java.util.UUID sessionId)
java.util.UUID	getSessionId()
java.util.Map<java.lang.String,byte[]>	getTraceHeaders()
Tracing.TraceType	getTraceType()
int	getTTL()
TraceState	initializeFromMessage(MessageIn<?> message) Determines the tracing context from a message.
static boolean	isTracing() Indicates if the current thread's execution is being traced.
java.util.UUID	newSession(java.util.Map<java.lang.String,java.nio.ByteBuffer> customPayload)
java.util.UUID	newSession(Tracing.TraceType traceType)
java.util.UUID	newSession(java.util.UUID sessionId, java.util.Map<java.lang.String,java.nio.ByteBuffer> customPayload)
protected java.util.UUID	newSession(java.util.UUID sessionId, Tracing.TraceType traceType, java.util.Map<java.lang.String,java.nio.ByteBuffer> customPayload)
protected abstract TraceState	newTraceState(java.net.InetAddress coordinator, java.util.UUID sessionId, Tracing.TraceType traceType)
void	set(TraceState tls) Before a task has been run, this will be called with the value from the thread that scheduled the task, and after the task is finished, the value that was previously retrieved from this thread is restored.
void	stopSession() Stop the session and record its complete.
protected abstract void	stopSessionImpl()
abstract void	trace(java.nio.ByteBuffer sessionId, java.lang.String message, int ttl) Called from OutboundTcpConnection for non-local traces (traces that are not initiated by local node == coordinator).
static void	trace(java.lang.String message)
static void	trace(java.lang.String format, java.lang.Object... args)
static void	trace(java.lang.String format, java.lang.Object arg)
static void	trace(java.lang.String format, java.lang.Object arg1, java.lang.Object arg2)
static void	traceRepair(java.lang.String format, java.lang.Object... args)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TRACE_HEADER

public static final java.lang.String TRACE_HEADER

See Also:

Constant Field Values

TRACE_TYPE

public static final java.lang.String TRACE_TYPE

See Also:

Constant Field Values

logger

protected static final org.slf4j.Logger logger

sessions

protected final java.util.concurrent.ConcurrentMap<java.util.UUID,TraceState> sessions

instance

public static final Tracing instance

Constructor Detail

Tracing

public Tracing()

Method Detail

getSessionId

public java.util.UUID getSessionId()

getTraceType

public Tracing.TraceType getTraceType()

getTTL

public int getTTL()

isTracing

public static boolean isTracing()

Indicates if the current thread's execution is being traced.

newSession

public java.util.UUID newSession(java.util.Map<java.lang.String,java.nio.ByteBuffer> customPayload)

newSession

public java.util.UUID newSession(Tracing.TraceType traceType)

newSession

public java.util.UUID newSession(java.util.UUID sessionId,
                                 java.util.Map<java.lang.String,java.nio.ByteBuffer> customPayload)

newSession

protected java.util.UUID newSession(java.util.UUID sessionId,
                                    Tracing.TraceType traceType,
                                    java.util.Map<java.lang.String,java.nio.ByteBuffer> customPayload)

doneWithNonLocalSession

public void doneWithNonLocalSession(TraceState state)

stopSession

public void stopSession()

Stop the session and record its complete. Called by coodinator when request is complete.

stopSessionImpl

protected abstract void stopSessionImpl()

get

public TraceState get()

Description copied from interface: ExecutorLocal

This is called when scheduling the task, and also before calling ExecutorLocal.set(Object) when running on a executor thread.

Specified by:

get in interface ExecutorLocal<TraceState>

Returns:

The thread-local value that we want to copy across executor boundaries; may be null if not set.

get

public TraceState get(java.util.UUID sessionId)

set

public void set(TraceState tls)

Description copied from interface: ExecutorLocal

Before a task has been run, this will be called with the value from the thread that scheduled the task, and after the task is finished, the value that was previously retrieved from this thread is restored.

Specified by:

set in interface ExecutorLocal<TraceState>

Parameters:

tls - Value to use for the executor local state; may be null.

begin

public TraceState begin(java.lang.String request,
                        java.util.Map<java.lang.String,java.lang.String> parameters)

begin

public abstract TraceState begin(java.lang.String request,
                                 java.net.InetAddress client,
                                 java.util.Map<java.lang.String,java.lang.String> parameters)

initializeFromMessage

public TraceState initializeFromMessage(MessageIn<?> message)

Determines the tracing context from a message. Does NOT set the threadlocal state.

Parameters:

message - The internode message

getTraceHeaders

public java.util.Map<java.lang.String,byte[]> getTraceHeaders()

newTraceState

protected abstract TraceState newTraceState(java.net.InetAddress coordinator,
                                            java.util.UUID sessionId,
                                            Tracing.TraceType traceType)

traceRepair

public static void traceRepair(java.lang.String format,
                               java.lang.Object... args)

trace

public static void trace(java.lang.String message)

trace

public static void trace(java.lang.String format,
                         java.lang.Object arg)

trace

public static void trace(java.lang.String format,
                         java.lang.Object arg1,
                         java.lang.Object arg2)

trace

public static void trace(java.lang.String format,
                         java.lang.Object... args)

trace

public abstract void trace(java.nio.ByteBuffer sessionId,
                           java.lang.String message,
                           int ttl)

Called from OutboundTcpConnection for non-local traces (traces that are not initiated by local node == coordinator).